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3 平地机械土地是否平整 ,可显著影响灌溉水的利用率 ,一般进入田间的灌水量有 1/ 3由于深层渗漏、积水、跑水等原因而浪费掉 ,即田间水利用系数只有 0 6～ 0 7,其主要原因就是土地不平整。所以 ,平整土地是实施地面灌溉的先决条件。人工平整土地耗资很大 ,费工很多 ,精度较
3 Whether the land of flat land is flat or not can significantly affect the utilization rate of irrigation water. Generally, 1/3 of the irrigation water entering the field was wasted due to deep seepage, stagnant water and running water, that is, the coefficient of field water utilization is only 0 6 ~ 0 7, the main reason is the land is not flat. Therefore, the formation of land is a prerequisite for the implementation of surface irrigation. Artificial land formation cost a lot, a lot of work, accuracy